JP6915378B2 - Molding film and molding transfer foil using it - Google Patents

Description

The present invention relates to a molding film containing a polypropylene-based resin and a polyethylene-based resin, and a molding transfer foil using the same.

In recent years, due to heightened environmental awareness, there has been an increasing demand for solvent-less coating and decoration methods that replace plating in fields such as building materials, automobile parts, mobile phones, and electrical products. The introduction is in progress. Then, as a method for decorating a three-dimensional three-dimensional shape member, a method is known in which a design layer is laminated on a thermoplastic resin film to form a molded transfer foil, and the design layer is transferred to the member at the time of molding.

Further, in such a decoration method, it has been proposed to use a film containing a polypropylene resin as a main component. However, when an attempt is made to apply a polypropylene-based resin film to a decorative application, the dimensional stability and flatness of the film may be impaired when laminating the design layers, and various attempts have been made to improve this point. It has been done.

For example, Patent Document 1 discloses a technique for molding a transparent resin sheet obtained by quenching a polypropylene-based resin into a non-planar shape. Further, Patent Document 2 discloses a technique for improving the dimensional stability of a film during processing by phase-separating a branched low-density polyethylene and a polypropylene-based resin.

Japanese Unexamined Patent Publication No. 2014-198416 Japanese Unexamined Patent Publication No. 10-168200

However, in the technique described in Patent Document 1, the dimensional change of the film is likely to occur in the steps of coating, laminating, printing, vapor deposition, etc. of the film, and there is a problem in terms of the dimensional stability of the film at the time of forming the design layer. .. Further, the technique described in Patent Document 2 has insufficient self-retaining property when the obtained film is used as a molded transfer foil, and molding processing such as vacuum pressure air molding is performed using the molded transfer foil using the film. Then, there was a problem that wrinkles were generated on the film and the wrinkles were transferred to the member.

An object of the present invention is to improve the problems of the prior art and to provide a molding film having both dimensional stability of the molding film at the time of forming a design layer and self-retaining property at the time of forming a molding transfer foil. And.

In order to solve the above problems, the present invention has the following configuration.
(1) A sea-island structure or polypropylene containing a polypropylene-based resin, a polyethylene-based resin, and inorganic particles having an average particle size of 0.1 μm or more and 5.0 μm or less, and the polyethylene-based resin is dispersed in the polypropylene-based resin as an island component. system resin have a layer having a sea-island structure dispersed in the polyethylene resin (a layer) as the island component in the a layer, the inorganic particles are often distributed in the sea component than in the island component, in the longitudinal direction In the cross section when the A layer is cut on a plane parallel to the film surface and perpendicular to the film surface, the area of the sea portion is 60% or more and 75% or less with respect to the total area of the A layer of 100%, and the area of the island portion. There is 40% or less than 25%, wherein the polypropylene-based resin is a homopolypropylene, said polyethylene resin is linear low density polyethylene, and the inorganic particles are characterized in calcium carbonate der Rukoto, molding For film .
( 2 ) The molding film according to (1) , wherein the surface roughness (SRa) of the film surface is 0.01 μm or more and 5.0 μm or less on both sides.
( 3 ) The molding film according to (1) or (2) , which is a film for molding transfer foil.
( 4 ) A molded transfer foil according to any one of (1) to ( 3 ), wherein the molding film, the design layer, and the adhesive layer are located in this order.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a molding film having both dimensional stability of the molding film at the time of forming a design layer and self-holding property at the time of forming a molded transfer foil. The molding film of the present invention is excellent in processability such as coating, laminating, printing, and vapor deposition, moldability in various molding methods such as vacuum compressed air molding, and surface appearance. Therefore, for example, building materials, automobile parts, mobile phones, and electric appliances. It can be suitably used for decorating products and molded members such as game machine parts.

It is sectional drawing when the molding film which concerns on one Embodiment of this invention is cut in the plane parallel to the longitudinal direction and perpendicular to a film plane, and shows an example of the sea-island structure of the molding film of this invention. .. It is a schematic diagram which shows an example of the 3D vacuum heating molding machine which can be used when molding a molding member by the molding transfer foil of this invention.

The molding film of the present invention contains a polypropylene resin, a polyethylene resin, and inorganic particles having an average particle size of 0.1 μm or more and 5.0 μm or less, and the polyethylene resin is dispersed in the polypropylene resin as an island component. It is characterized by having a sea-island structure or a layer (A layer) having a sea-island structure in which a polypropylene-based resin is dispersed in a polyethylene-based resin as an island component. By adopting such an aspect, the molding film has both dimensional stability at the time of forming the design layer and self-retaining property at the time of forming the molding transfer foil for molding.

Here, having the A layer means having either a single-layer structure having only the A layer or a laminated structure having at least one A layer. When a plurality of layers A are provided, their compositions may be the same or different from each other as long as the effects of the present invention are not impaired. The layer structure of the molding film of the present invention is not particularly limited as long as it has the A layer, but it is preferable that the layer structure is only the A layer from the viewpoint of manufacturing cost and productivity.

(Polypropylene resin)
It is important that the A layer contains a polypropylene resin from the viewpoint of improving the quality, heat resistance, moldability, and self-retaining property of the molded transfer foil. The polypropylene-based resin refers to a resin containing 50% by mass or more and 100% by mass or less of a propylene monomer-derived component in 100% by mass of the entire resin.

The polypropylene-based resin is not particularly limited as long as the effects of the present invention are not impaired. For example, a homopolypropylene resin which is a homopolymer of propylene, a random polypropylene resin copolymerized with ethylene, and an ethylene / propylene copolymer during polypropylene polymerization. Block polypropylene resin or the like blended with an elastomer component can be used alone or in combination of two or more. Above all, from the viewpoint of improving the quality, heat resistance, moldability, and self-retaining property of the molded transfer foil, and the incompatibility with the polyethylene resin, the homopolypropylene resin and the random polypropylene resin Is preferably used alone or in combination, and it is more preferable to use the homopolypropylene resin alone.

(Polyethylene resin)
It is important that the A layer contains a polyethylene-based resin from the viewpoint of improving the quality of the molding film, heat resistance, and self-retaining property when the molded transfer foil is formed. The polyethylene-based resin refers to a resin containing 50% by mass or more and 100% by mass or less of an ethylene monomer-derived component in 100% by mass of the entire resin.

The polyethylene-based resin is not particularly limited as long as the effect of the present invention is not impaired, but is not particularly limited from the viewpoint of improving the quality of the molding film, heat resistance, and self-retaining property when made into a molded transfer foil, and non-polypropylene-based resin. From the viewpoint of compatibility, low density polyethylene (LDPE: polyethylene with a density of 900 to 945 kg / m ³ produced by the high pressure method), high density polyethylene (HDPE: polyethylene with a density ^{greater than 945 kg / m 3} ), and linear low It is preferably at least one resin selected from the group consisting of density polyethylene (LLDPE: polyethylene having a density of 900 to 945 kg / m ^{3 produced by a low pressure method using a single-site or multi-site catalyst), and is preferably high-density polyethylene.} And / or linear low density polyethylene is more preferred, and linear low density polyethylene is even more preferred.

(Sea island structure)
It is important that the layer A has a sea-island structure in which the polyethylene-based resin is dispersed in the polypropylene-based resin as an island component, or a sea-island structure in which the polypropylene-based resin is dispersed in the polyethylene-based resin as an island component. The sea-island structure refers to a structure having an island component (dispersed phase) dispersed in a sea component (continuous phase) (Fig. 1). With such an aspect, it is possible to achieve both the dimensional stability of the molding film at the time of forming the design layer and the self-retaining property at the time of forming the molded transfer foil.

The sea-island structure in the present invention may be any of the above-mentioned ones, but a sea-island structure in which the polyethylene-based resin is dispersed in the polypropylene-based resin as an island component is preferable. By having such a sea-island structure, the moldability of the film can be further improved. When a plurality of layers A are present, the sea component and the island component of the sea-island structure may be the same or different from each other as long as the effects of the present invention are not impaired. That is, the island component may be a polyethylene resin in one layer A, and the island component may be a polypropylene resin in the other layer A.

The effect of the present invention can be used as a means for forming a sea-island structure in which the polyethylene-based resin is dispersed in the polypropylene-based resin as an island component, or a sea-island structure in which the polypropylene-based resin is dispersed in the polyethylene-based resin as an island component in the A layer. There are no particular restrictions as long as it is not impaired. For example, a sea-island structure can be easily formed by combining a polyethylene-based resin and a polypropylene-based resin with a low compatibility.

Further, the A layer is formed on a surface parallel to the longitudinal direction and perpendicular to the film surface from the viewpoint of improving the dimensional stability of the molding film at the time of forming the design layer and the self-retaining property when the molded transfer foil is formed. In the cross section when cut, the area of the sea portion is preferably 50% or more and 75% or less, and the area of the island portion is preferably 25% or more and 50% or less with respect to the area of the entire layer A, preferably the sea. It is more preferable that the area of the portion is 60% or more and 70% or less, and the area of the island portion is 30% or more and 40% or less. With such an aspect, it is possible to achieve both the dimensional stability of the molding film at the time of forming the design layer and the self-retaining property at the time of forming the molded transfer foil.

Here, the longitudinal direction refers to the direction in which the film advances during film production, and the width direction refers to a direction parallel to the transport surface of the film and orthogonal to the longitudinal direction. When the film is wound on a roll, the longitudinal direction and the width direction can be easily specified, but in the case of a sheet-like film which is not wound on the roll, the longitudinal direction and the width direction can be easily specified. May not be easily identified. In such a case, after measuring the heat shrinkage of the film in one direction arbitrarily selected by the method described later, rotate the film 5 ° to the right to perform the same measurement until it reaches 175 °. It is assumed that the direction having the largest value of the heat shrinkage rate is repeatedly treated as the longitudinal direction. Hereinafter, the same shall apply in the present invention.

The heat shrinkage rate can be measured by the following procedure. First, a 200 mm marked line is marked parallel to the measurement direction on a 250 mm (measurement direction) × 10 mm rectangular film sample. Next, a 3 g weight was attached to one end of the film sample, the film sample was hung so that the weight was on the bottom, and the film sample was heat-treated at 80 ° C. for 5 minutes in a hot air circulation oven, and then the length of the marked line was measured. do. Using the length of the obtained marked line, the heat shrinkage rate in the measurement direction is calculated by the following formula.
Heat shrinkage rate (%) = [1- (length of marked line after heat treatment (mm) / 200 (mm)) x 100
When there are a plurality of A layers, the entire A layer does not mean a combination of all the A layers, but means the entire A layer. That is, when there are a plurality of A layers, "in the cross section when the A layer is cut on a plane parallel to the longitudinal direction and perpendicular to the film surface, the area of the sea portion is 100% of the total area of the A layer. 50% or more and 75% or less, and the area of the island portion is 25% or more and 50% or less ", it is sufficient that at least one of the A layers satisfies the requirement.

The area of the sea portion and the area of the island portion can be measured by an enlarged image of a cross section when the A layer is cut on a plane parallel to the longitudinal direction and perpendicular to the film plane. The molding film of the present invention contains inorganic particles described later and other components as needed, but these components are distributed in the sea portion when measuring the area of the sea portion and the island portion. Is treated as the sea part, and these components distributed in the island part are treated as the island part. In addition, these components distributed on the boundary between the sea part and the island part are treated as sea components.

The means for setting the area of the sea portion to 50% or more and 75% or less and the area of the island portion to 25% or more and 50% or less with respect to 100% of the total area of the film is particularly limited as long as the effect of the present invention is not impaired. However, for example, the mixing ratio (volume ratio) of the polypropylene-based resin and the polyethylene-based resin may be adjusted to a desired value. More specifically, the closer the mixing ratio is to 1: 1, the smaller the area of the sea component and the larger the area of the island component.

(Inorganic particles)
The molding film of the present invention has an average particle size of 0 from the viewpoint of achieving both workability when used as a molded transfer foil and designability of a molded member (hereinafter, may be referred to as a product member) after molding and decoration. . It is important to include inorganic particles that are 1 μm or more and 5.0 μm or less. Here, the average particle size means an average particle size measured by a laser diffraction method.

If the average particle size of the inorganic particles is less than 0.1 μm, the processability of the molded transfer foil may be impaired. On the other hand, if the average particle size of the inorganic particles exceeds 5.0 μm, the design of the surface of the product member may be impaired. The preferable range of the average particle size of the inorganic particles is 0.2 μm or more and 2.0 μm or less, and more preferably 0.3 μm or more and 1.0 μm or less.

Further, in the molding film of the present invention, there are more inorganic particles in the sea component than in the island component from the viewpoint of improving the quality, self-retaining property when made into a molded transfer foil, and the design of the product member. It is preferably distributed. Here, the fact that more inorganic particles are distributed in the sea component than in the island component means that the number of inorganic particles contained in a unit area in the cross section when the film is cut on a plane parallel to the longitudinal direction and perpendicular to the film plane. Is a state in which there are more sea components than island components. By adopting such an aspect, it is possible to improve the self-retaining property when the molded transfer foil is formed.

The inorganic particles are not particularly limited as long as they do not satisfy the above requirements and impair the effects of the present invention, but from the viewpoint of dispersing in polypropylene-based resin and / or polyethylene-based resin, silicon oxide such as silica, calcium carbonate, magnesium carbonate , Various carbonates such as barium carbonate, various sulfates such as calcium sulfate and barium sulfate, various complex oxides such as kaolin and talc, various phosphates such as lithium phosphate, calcium phosphate and magnesium phosphate, aluminum oxide and oxidation. It is preferable to use various oxides such as titanium and zirconium oxide and fine particles such as lithium fluoride individually or in combination, and silicon oxide such as silica, various carbonates such as calcium carbonate, magnesium carbonate and barium carbonate, and calcium sulfate. , Various sulfates such as barium sulfate are more preferably used alone or in combination of two or more.

(Film surface roughness)
The molding film of the present invention has a film surface roughness (SRa) of 0.01 μm or more on both sides from the viewpoint of achieving both the design of the molded member and the film winding property (processability of the molded transfer foil). It is preferably 5.0 μm or less, more preferably 0.05 μm or more and 2.0 μm or less, and further preferably 0.1 μm or more and 1.0 μm or less.

By setting SRa to 5.0 μm or less on the surface of the molding film on which the design layer is provided, the degree of unevenness on the surface of the product member can be kept to the extent that the design of the product member itself is not impaired. On the other hand, by setting SRa to 0.01 μm or more, sufficient surface slipperiness of the molding film can be ensured when the design layer is provided, and molding is performed in the process of winding the molding film provided with the design layer into a roll shape. It is possible to reduce the occurrence of wrinkles and the like on the film.

Further, on the surface of the molding film located on the opposite side of the surface on which the design layer is provided (hereinafter, may be referred to as the back surface), the SRa is set to 5.0 μm or less so that the molding film provided with the design layer is provided. In the process of winding the film into a roll, it is possible to reduce the transfer of unevenness on the back surface of the molding film to the design layer. On the other hand, by setting SRa to 0.01 μm or more, sufficient surface slipperiness of the molding film can be ensured when the design layer is provided, and molding is performed in the process of winding the molding film provided with the design layer into a roll shape. It is possible to reduce the occurrence of wrinkles and the like on the film.

The method for setting SRa to 0.01 μm or more and 5.0 μm or less on both sides or the above-mentioned preferable range is not particularly limited as long as the effect of the present invention is not impaired, and for example, a resin for obtaining the outermost layer of a molding film. Examples thereof include a method of incorporating inorganic particles into the composition and a method of forming protrusions on the surface of the film. More specifically, SRa can be increased by increasing the content of inorganic particles.

(Manufacturing method of molding film)
Next, the method for producing the molding film of the present invention will be specifically described by taking as an example a film containing homopolypropylene and linear low-density polyethylene. It is not limited.

In obtaining the composition used for obtaining the molding film of the present invention, that is, the composition containing homopolypropylene, linear low-density polyethylene, inorganic particles, etc., the composition is melt-kneaded by melting and kneading each component. It is preferable to use the melt-kneading method to be produced. The melt-kneading method is not particularly limited, and a known mixer such as a kneader, a roll mill, a Banbury mixer, a single-screw or twin-screw extruder can be used. Above all, from the viewpoint of productivity, it is preferable to use a single-screw extruder.

Next, the resin composition obtained by the above method is discharged from a T-die into a sheet and cooled and solidified on a temperature-controlled cast roll to obtain the molding film of the present invention. The temperature of the cast roll is preferably controlled to 10 ° C. or higher and 60 ° C. or lower. Further, from the viewpoint of easily adjusting the SRa of the molding film, at the stage of cooling and solidifying on the sheet-like cast roll, nip is performed with a matte rubber shaping roll whose temperature is controlled to 20 ° C. or higher and 40 ° C. or lower. Can also be preferably done.

(Molded transfer foil)
Since the molding film of the present invention is excellent in dimensional stability of the molding film at the time of forming the design layer and self-retaining property when it is made into a molding transfer foil, it can be suitably used as a film for molding transfer foil. In the molded transfer foil of the present invention, it is important that the molding film, the design layer, and the adhesive layer of the present invention are located in this order.

Here, the design layer refers to a layer for adding decorations such as coloring, pattern, wood grain, metal tone, and pearl tone to the molded member, and the adhesive layer means adhesion between the molded member and the design layer. Refers to the layer responsible for. Further, the fact that the molding film, the design layer, and the adhesive layer of the present invention are located in this order means that there is a layer between the molding film and the design layer of the present invention and / or between the design layer and the adhesive layer. Regardless of whether or not, it means a state in which the molding film, the design layer, and the adhesive layer of the present invention are arranged in this order.

The method for forming the design layer is not particularly limited as long as the effect of the present invention is not impaired, and for example, coating, printing, metal deposition and the like can be used. Examples of the resin used for the design layer include polyester resin, polyolefin resin, acrylic resin, urethane resin, fluorine resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, and ethylene-. Vinyl acetate copolymer system Resin copolymer and the like can be mentioned. Further, the colorant used for the design layer is not particularly limited, and can be appropriately selected from dyes, inorganic pigments, organic pigments and the like in consideration of dispersibility in the resin and the like.

The thickness of the design layer formed by coating or printing is preferably 1 μm or more and 100 μm or less, more preferably 2 μm or more and 50 μm or less, and 5 μm or more, from the viewpoint of color tone retention and design after molding. It is more preferably 40 μm or more.

When the method for forming the design layer is metal deposition, the method for producing the vapor deposition book film is not particularly limited as long as the effect of the present invention is not impaired. For example, vacuum deposition method, EB vapor deposition method, sputtering method, and ion plating. A method or the like can be used. The metal used for vapor deposition is preferably indium or tin, and more preferably indium, from the viewpoint of moldability of the design layer.

The thickness of the design layer formed by metal vapor deposition is preferably 0.001 μm or more and 100 μm or less, preferably 0.01 μm or more and 50 μm or less, from the viewpoint of the design property of the product member and the flatness and productivity of the molded transfer foil. It is more preferable that it is 0.02 μm or more and 30 μm or less.

If the thickness of the design layer formed by metal vapor deposition is less than 0.001 μm, the concealing property of the portion where the film is stretched during molding is lowered, and the design property of the product member as a whole may be impaired. Further, if the thickness of the design layer formed by metal vapor deposition exceeds 100 μm, the productivity of the molded transfer foil and the flatness of the molding film may deteriorate.

The material of the adhesive layer is not particularly limited as long as the effect of the present invention is not impaired, and can be appropriately selected according to the material of the molded member and the material. For example, if the molding member is a resin composition containing an acrylic resin as a main component, an acrylic resin, a polyphenylene oxide / polystyrene resin, a polycarbonate resin, a styrene copolymer resin, or the like may be used alone or in combination of two or more. Is preferable. If the molding member is a resin composition containing a polystyrene-based resin as a main component, it is preferable to use an acrylic resin, a polystyrene-based resin, a polyamide-based resin, or the like having an affinity for these resins alone or in combination of two or more. .. If the molding member is a resin composition containing a polypropylene resin as a main component, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, a Kumaron inden resin, etc. may be used alone or in combination of two or more. It is preferable to use them in combination.

Further, as the type of the adhesive layer, there are a heat-sensitive type that can be bonded by heating and a pressure-sensitive type that can be bonded by applying pressure, and these are appropriately selected according to the material and material of the molded member. be able to.

Various methods can be used for forming the adhesive layer. For example, in addition to a coating method such as a roll coating method, a gravure coating method, and a comma coating method, a printing method such as a gravure printing method or a screen printing method can be used. ..

From the viewpoint of scratch resistance, weather resistance, and designability of the surface of the molded member after molding and decoration, a layer for protecting the design layer transferred to the molding member between the design layer and the molding film (hereinafter referred to as a layer). It is preferable to have a protective layer).

The material of the protective layer is not particularly limited as long as the effect of the present invention is not impaired, but a highly transparent resin may be used because it reduces the influence on the visibility of the design layer and has easy moldability. preferable. Examples of highly transparent resins include polyester resins, polyolefin resins, acrylic resins, urethane resins, fluororesins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, and ethylene-vinyl acetate. Examples thereof include a copolymerization system resin. Of these, polyester resins, acrylic resins, and urethane resins are preferably used from the viewpoint of scratch resistance and chemical resistance. Further, these resins may be used alone or in admixture of a plurality of types as long as the effects of the present invention are not impaired.

Further, the molded member is not particularly limited as long as the effect of the present invention is not impaired, and for example, a resin such as polypropylene resin, acrylic resin, polystyrene resin, polyacrylonitrile / styrene, polyacrylonitrile / butadiene / styrene, or a metal. Members and the like are used.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

[Measurement and evaluation method]
The measurements and evaluations shown in the examples were performed under the following conditions. However, Examples 4 and 8 below are used as reference examples.

(1) Film surface roughness SRa
The surface roughness SRa of the film was measured using an optical interference type microscope (“VertScan” (registered trademark) 2.0 manufactured by Ryoka System Co., Ltd.) in an observation mode = Forcus mode, a filter = 530 nm white, and a Scan Range = 105 nm. The surface morphology was observed and the average surface roughness of the center line was determined. The measurement was performed three times for each of the design layer-imparted surface and the back surface, and the average value of each was taken as the surface roughness (SRa) of the film surface on the design layer-imparted surface and the back surface.

(2) Overall film thickness The thickness of the sample cut out from the film at any five points was measured with a dial gauge, and the average value was taken as the overall thickness of the film.

(3) Area ratio of sea part to island part The film is cut along a plane parallel to the longitudinal direction and perpendicular to the film plane, and the cross section is magnified at a magnification of 100 times using a metallurgical microscope LeicaDMLM manufactured by Leica Microsystems. I took the image. Next, the contour of the island portion in the captured image was specified, the image was binarized, and the area ratio (%) of the island portion to 100% of the area of the entire cross section of the film was measured. Then, the area ratio (%) of the island portion was subtracted from the area 100% of the entire cross section of the film to calculate the area ratio (%) of the sea portion. The measurement was performed 5 times, and the average values were taken as the area ratio (%) of the island part and the area ratio (%) of the sea part, respectively.

(4) Self-retaining film roll sample of molded transfer foil Using an applicator, black ink obtained by dispersing carbon black in acrylic resin (6500B manufactured by Toyo Chemical Co., Ltd.) is applied to form a design layer. Formed. Further, the above film roll sample was cut out at an arbitrary position to a size of 200 mm × 300 mm to prepare a sample. A polyester adhesive (PPET-1501S manufactured by Toagosei Co., Ltd.) is applied to the surface of the sample using an applicator and dried at 80 ° C. for 10 minutes to form an adhesive layer having a coating film thickness of 20 μm to obtain a molded transfer foil. rice field. The molded transfer foil was vacuum-heated to 120 ° C. with a three-dimensional vacuum heating molding machine (TOM molding machine; model number NGF-0406-T (Fig. 2)) manufactured by Fuse Vacuum Co., Ltd., and the molded member heated to 50 ° C. (Polypropylene resin mold; bottom diameter 150 mm) Distance from film 50 mm) Vacuum pressure air molding was performed under the condition of pressure air 0.2 MPa to obtain a molded transfer foil (film / design layer / adhesive layer) / molded member. .. The self-retaining property of the molded transfer foil was evaluated based on the following criteria based on the degree of drawdown of the molded transfer foil during the vacuum heating step. The self-retaining property of the molded transfer foil was B or higher.
A: In the vacuum heating step, the drawdown of the molded transfer foil was less than 10 mm.
B: In the vacuum heating step, the molded transfer foil did not come into contact with the molded member, but the drawdown of the film was 10 mm or more and less than 50 mm.
C: In the vacuum heating step, the drawdown of the molded transfer foil was 50 mm or more, and it came into contact with the molded member.

(5) Moldability of molded transfer foil From the state of being molded along the mold using the method described in "(4) Self-retaining property of molded transfer foil" (drawing ratio: molding height / bottom diameter), The moldability of the molded transfer foil was evaluated according to the following criteria. The moldability of the molded transfer foil was C or higher.
A: Molding was possible with a drawing ratio of 1.0 or more.
B: Molding was possible with a drawing ratio of 0.8 or more and less than 1.0, but molding was not possible with a drawing ratio of 1.0 or more.
C: Molding was possible with a drawing ratio of 0.7 or more and less than 0.8, but molding was not possible with a drawing ratio of 0.8 or more.
D: Molding could not be performed with a drawing ratio of 0.7 or more.

(6) Dimensional stability of the molding film at the time of forming the design layer 100 mm (longitudinal direction) × Marking with a size of 100 mm (width direction) was performed. Next, the molding film wound on the above film roll was coated with black ink obtained by dispersing carbon black in an acrylic resin (6500B manufactured by Toyo Chemical Co., Ltd.) using an applicator, and dried at 80 ° C. for 5 minutes. A design layer having a coating film thickness of 30 μm was formed. A portion marked before the molding film having the design layer thus obtained is cut out to prepare a sample, and the width direction and longitudinal dimensions of the sample after the design layer is formed are measured with a caliper, and the design layer is measured according to the following criteria. The workability at the time of formation was evaluated. Here, the width direction means a direction parallel to the film surface and orthogonal to the longitudinal direction. In addition, the workability at the time of forming the design layer was C or higher.
A: The dimensional change in both the width direction and the longitudinal direction of the film is less than 1 mm.
B: There is a dimensional change of 1 mm or more and less than 5 mm in at least one of the width direction and the longitudinal direction of the film, and there is no dimensional change of 5 mm or more in either the width direction and the longitudinal direction of the film.
C: There is a dimensional change of 5 mm or more and less than 10 mm in at least one of the width direction and the longitudinal direction of the film, and there is no dimensional change of 10 mm or more in either the width direction and the longitudinal direction of the film.
D: There is a dimensional change of 10 mm or more in at least one of the width direction and the longitudinal direction of the film.

(7) Surface Appearance of Product Member The surface of the film roll was coated with an acrylic / urethane-based black ink by a die coater and dried at 80 ° C. for 10 minutes to form a design layer having a coating film thickness of 30 μm. Further, 892L manufactured by Nippon Chemical Co., Ltd. was applied onto the design layer using an applicator. Then, it was dried at 80 ° C. for 10 minutes to form an adhesive layer having a coating film thickness of 20 μm, and a molded transfer foil roll was prepared. A molded transfer foil was cut out from the obtained molded transfer foil roll to a size of 200 mm (mechanical direction) × 300 mm (width direction) at an arbitrary position. Next, the molded transfer foil and the molded member were overlapped in the order of film / design layer / adhesive layer / molded member (flat polypropylene resin mold) and vacuum compressed air molding was performed, and the obtained molded body was irradiated with irradiation intensity. The coating was cured by irradiating with ultraviolet rays so that the value was 2,000 mJ / cm ^2. After that, the surface of the product member obtained by peeling only the film was observed with a scanning white interference microscope (VS-1000 manufactured by Hitachi High-Technologies Corporation) at a magnification of 5 times, and the surface appearance was observed according to the following criteria. (Waviness: maximum point height of product member-minimum point height) was evaluated. The surface appearance of the product member was C or higher.
A: The swell was less than 0.01 mm.
B: The swell was 0.01 mm or more and less than 0.05 mm.
C: The waviness was 0.05 mm or more and less than 0.1 mm.
D: The swell was 0.1 mm or more.

(8) Workability of molded transfer foil A film roll sample coated with acrylic / urethane black ink is set in the unwinding of a die coater, the film is transported at a transport speed of 30 m / min, and the film is wound on the winding side. rice field. At this time, the transport state of the film was observed, and the workability was evaluated according to the following criteria. The processability of the molded transfer foil was C or higher.
A: The film was rolled up as a roll without wrinkles.
B: The film was wrinkled, but it was rolled up as a roll without blocking.
C: The film was wrinkled and blocking was confirmed, but it was rolled up as a roll.
D: The film could not be rolled up as a roll.

(Polypropylene resin)
"Prime Polypro" (registered trademark) J106 manufactured by Prime Polymer Co., Ltd.
(Polyethylene resin)
"Evolu" (registered trademark) SP2540 manufactured by Prime Polymer Co., Ltd.
(Inorganic Particle Masterbatch A)
Calcium carbonate (30% by mass in 100% by mass of masterbatch), polypropylene resin (70% by mass in 100% by mass of masterbatch) -based masterbatch calcium carbonate (manufactured by Maruo Calcium, trade name "Calcex R")
(Inorganic Particle Masterbatch B)
Calcium carbonate (30% by mass in 100% by mass of masterbatch), polyethylene resin (70% by mass in 100% by mass of masterbatch) -based masterbatch calcium carbonate (manufactured by Maruo Calcium, trade name "Calcex R")
(Example 1)
The resin composition for obtaining the sea portion and the resin composition for obtaining the island portion are mixed at the compositions shown in Table 1 and supplied to a single-screw extruder (screw length / screw diameter (L / D): 30), respectively. did. Next, these are melted at a supply unit temperature of 230 ° C. and a subsequent temperature of 240 ° C., passed through a leaf disk filter having a filtration accuracy of 50 μm, and then heated to 40 ° C. from a T-die (lip gap: 0.4 mm). When the sheet is discharged onto the controlled metal shaping roll, the nip is made with the matte rubber shaping roll whose temperature is controlled to 30 ° C. (nip pressure: 0.2 MPa), and the film has a film thickness of 100 μm. Got Table 1 shows the evaluation results of the obtained film, the molded transfer foil using the same, and the molded member.

(Examples 2 to 13, Comparative Examples 1 to 4)
A film was obtained in the same manner as in Example 1 except that the composition of the resin composition for obtaining the sea portion and the composition of the resin composition for obtaining the island portion were as described in Tables 1 and 2 (however, comparison). In Examples 1 and 2, there is no resin composition for obtaining the island portion.) Tables 1 and 2 show the evaluation results of the obtained film, the molded transfer foil using the same, and the molded member.

The content of each component in the resin composition for obtaining the sea portion and the resin composition for obtaining the island portion was calculated assuming that the total of each composition was 100% by mass.
The area ratio (%) of the sea portion and the area ratio (%) of the sea portion were calculated assuming that the entire film was 100%.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a molding film having both dimensional stability of the molding film at the time of forming a design layer and self-holding property at the time of forming a molded transfer foil. The molding film of the present invention is excellent in processability such as coating, laminating, printing, and vapor deposition, moldability in various molding methods such as vacuum compressed air molding, and surface appearance. Therefore, for example, building materials, automobile parts, mobile phones, and electric appliances. It can be suitably used for decorating products and molded members such as game machine parts.

1 Molding film 2 Sea component 3 Island component 4 Inorganic particles 5 Three-dimensional vacuum heating molding machine 6 Molding transfer foil 7 Molding member 8 Pedestal 9 Heating heater 10 Vacuum pressure chamber 11 Drawdown

Claims (4)

A sea-island structure or a polypropylene-based resin containing a polypropylene-based resin, a polyethylene-based resin, and inorganic particles having an average particle size of 0.1 μm or more and 5.0 μm or less in which the polyethylene-based resin is dispersed in the polypropylene-based resin as an island component. have a layer (a layer) having a sea-island structure dispersed in the polyethylene resin as an island component,
In the A layer, more inorganic particles are distributed in the sea component than in the island component.
In the cross section when the A layer is cut on a plane parallel to the longitudinal direction and perpendicular to the film surface, the area of the sea portion is 60% or more and 75% or less with respect to the total area of the A layer, and the islands. The area of the part is 25% or more and 40% or less,
Wherein the polypropylene-based resin is a homopolypropylene, said polyethylene resin is linear low density polyethylene, and the inorganic particles are characterized in calcium carbonate der Rukoto, molding the film. The molding film according to claim 1 , wherein the surface roughness (SRa) of the film surface is 0.01 μm or more and 5.0 μm or less on both sides. The molding film according to claim 1 or 2 , wherein the film is a molding transfer foil film. A molded transfer foil, wherein the molding film, the design layer, and the adhesive layer according to any one of claims 1 to 3 are located in this order.

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